![Chelmno environs, spring 1942 [LCID: che42060]](https://encyclopedia.ushmm.org/images/large/c1419b23-b517-43a2-844d-2aae4e653a76.gif)
The Chełmno killing center in German-occupied Poland was the first stationary facility where the Nazis used poisonous gas for the mass murder of Jews. The Chełmno killing center consisted of two main parts: the manor house (located in the village of Chełmno) and a large clearing in the Rzuchów forest. The SS and police murdered at least 152,000 Jews and 4,300 Roma at Chełmno.
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